Dielectric and Piezoelectric Properties of Low-Temperature-Sintering Pb(Mg_(1/2)W_(1/2))O_3-Pb(Ni_(1/3)Nb_(2/3))O_3-Pb(Zr, Ti)O_3 Ceramics for Multilayer Piezoelectric Actuator

摘要

In this study, in order to develop low-temperature-sintering ceramics for a multilayer piezoelectric actuator, Pb(Mg_(1/2)-W_(1/2))O_3-Pb(Ni_(1/3)Nb_(2/3))O_3-Pb(Zr, Ti)O_3 (PMW-PNN-PZT) ceramics were fabricated using Li_2CO_3 and CaCO_3 as sintering aids and their dielectric and piezoelectric properties were investigated in relation to the amount of Bi substitution. Piezoelectric actuators require both a high piezoelectric constant (d_(33)) and a high electromechanical coupling factor (kp). Accordingly, in this study, Bi was substituted at the Pb site of basic composition PMW-PNN-PZT ceramics for the enhancement of kp and d_(33). With increasing Bi substitution, density gradually increased. At the sintering temperature of 900℃, the electromechanical coupling factor (kp) and piezoelectric constant (d_(33)) of PMW-PNN-PZT composition ceramics with 1.0 mol % Bi substitution as well as 0.2 wt% Li_2CO_3 and 0.25 wt% CaCO_3 showed the optimal value of 0.618 and 473 pC/N, respectively, for multilayer piezoelectric actuator application.